jQuery.extend({
    createUploadIframe: function(id, uri){
            var frameId = 'jUploadFrame' + id;
            if(window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if(typeof uri== 'boolean'){
                    io.src = 'javascript:false';
                }
                else if(typeof uri== 'string'){
                    io.src = uri;
                }
            }else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';
            document.body.appendChild(io);
            return io			
    },createUploadForm: function(id, fileElementId){
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
		var oldElement = $('#' + fileElementId);
		var newElement = $(oldElement).clone();
		$(oldElement).attr('id', fileId);
		$(oldElement).before(newElement);
		$(oldElement).appendTo(form);
		//set attributes
		$(form).css('position', 'absolute');
		$(form).css('top', '-1200px');
		$(form).css('left', '-1200px');
		$(form).appendTo('body');		
		return form;
    },ajaxFileUpload: function(s) {		
        s = jQuery.extend({}, jQuery.ajaxSettings, s);
        var id = new Date().getTime()        
		var form = jQuery.createUploadForm(id, s.fileElementId);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;		
        if ( s.global && ! jQuery.active++ ){
			jQuery.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        var xml = {}   
        if ( s.global )
            jQuery.event.trigger("ajaxSend", [xml, s]);
        var uploadCallback = function(isTimeout){			
			var io = document.getElementById(frameId);
            try {				
				if(io.contentWindow)
				{
					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
					 
				}else if(io.contentDocument)
				{
					 xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}						
            }catch(e){
				jQuery.handleError(s, xml, null, e);
			}
            if ( xml || isTimeout == "timeout") {				
                requestDone = true;
                var status;
                try {
                    status = isTimeout != "timeout" ? "success" : "error";
                    if ( status != "error" ){
                        var data = jQuery.uploadHttpData( xml, s.dataType );    
                        if ( s.success )
                            s.success( data, status );
                        if( s.global )
                            jQuery.event.trigger( "ajaxSuccess", [xml, s] );
                    } else
                        jQuery.handleError(s, xml, status);
                } catch(e) {
                    status = "error";
                    jQuery.handleError(s, xml, status, e);
                }
                if( s.global )
                    jQuery.event.trigger( "ajaxComplete", [xml, s] );
                if ( s.global && ! --jQuery.active )
                    jQuery.event.trigger( "ajaxStop" );
                if ( s.complete )
                    s.complete(xml, status);
                jQuery(io).unbind()
                setTimeout(function(){	try {
											$(io).remove();
											$(form).remove();	
										} catch(e) {
											jQuery.handleError(s, xml, null, e);
										}									
									}, 100)
                xml = null
            }
        }
        if ( s.timeout > 0 ){
            setTimeout(function(){
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try{
			var form = $('#' + formId);
			$(form).attr('action', s.url);
			$(form).attr('method', 'POST');
			$(form).attr('target', frameId);
            if(form.encoding){
                form.encoding = 'multipart/form-data';				
            } else{				
                form.enctype = 'multipart/form-data';
            }			
            $(form).submit();
        } catch(e) {			
            jQuery.handleError(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        } else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        } 		
        return {abort: function () {}};	
    },
    uploadHttpData: function( r, type ) {
        var data = !type;
        data = type == "xml" || data ? r.responseXML : r.responseText;
        if ( type == "script" ) jQuery.globalEval( data );
        if ( type == "json" ) eval( "data = " + data );
        if ( type == "html" )jQuery("<div>").html(data).evalScripts();
        return data;
    },
	handleError: function( s, xhr, status, e ) 		{
		if ( s.error ) {
			s.error.call( s.context || s, xhr, status, e );
		}

		if ( s.global ) {
			(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
		}
	}
})